I am a little stuck and can't seem to work this out from the apple docs.
I have two buttons in an NSTable column, contained within an NSTableCellView.
I am trying to, in code, hide the button depending on the values of the object in the row.
Getting the values is fine, but i can't work out how to target the specific button, i can't bind it to an outlet as it's within a table. I have tried the below code, but that just hides the entire NSTableCellView rather than the specific button, i have also tried changing the identifier to be of the button, but that seems to do the same.
if(selectedTweet.imageURL){
NSButton *imageButton = [tableView makeViewWithIdentifier:#"secondButtons" owner:self];
[imageButton setHidden:NO];
return imageButton;
} else {
NSButton *imageButton = [tableView makeViewWithIdentifier:#"secondButtons" owner:self];
[imageButton setHidden:YES];
return imageButton;
}
This is obviously much simpler than i am making it?? Help greatly appreciated.
Thanks
Gareth
If you are using CocoaBindings to populate that table, you can just bind the button's "Hidden" attribute to Table Cell View/objectValue.imageURL and use the NSIsNil value transformer. No code needed at all.
If you are using an old-fashioned data source, things become a tad more complicated. In that case you could have a imageButton property in your object, and set it in the NSTableViewDelegate's - (NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row method.
Related
When I use a custom view as the cell of a view-based NSTableView, the custom view is somewhat below the table row. When I click on it, instead of affecting the elements (e.g. text field) custom view, the table row was selected (and highlighted). I have to reclick to select the text field.
- (NSView*)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
NSLog(#"We are creating views!");
NSTableCellView *newView;
newView = [tableView makeViewWithIdentifier:#"PostCell" owner:self];
NSTextField *newTextField = [[NSTextField alloc] init];
[newView addSubview:newTextField];
return newView;
}
When I disable the row selection according to NSTableView - Disable Row Selection, there was no selection.
- (BOOL)selectionShouldChangeInTableView:(NSTableView *)tableView {
return NO;
}
But I still cannot select directly the text field. What's worse, I cannot even select it using the mouse. Only tab on the keyboard works.
There seem to be something above it. But is it the "table column" shown in interface builder? Or something else?
How can I fix this?
Use a custom subclass of NSTableView and override -validateProposedFirstResponder:forEvent: to return YES.
See this blog entry from the Apple engineer who wrote the view-based table view code.
Make sure following code is present.
- (BOOL)tableView:(NSTableView *)aTableView shouldSelectRow:(NSInteger)rowIndex {
return YES;
}
You may try logging the subviews Or you can check superviews of view.
This will help to understand view hierarchy.
Also on side note if one of the view's userInteraction is disable then it's subview's won't be able to receive the events. Please verify that all the views and it's subviews userInteraction is enable.
I hope this helps.
i try to get my head around view-based NSTableViews on OS X.
My Problem is that in the loaded view cell (NSView subclass) the subviews are not initialized when i try to assign the values in my delegate.
At the moment the correct count and the correct view is displayed, but i cannot access the subviews to assign the proper values.
What i have done so far:
Created the xib with the custom view cell in Interface Builder.
Created the custom class for the cell and assigned it in IB.
This work fine and i can see the properties in the Debugger. Correct class
and the properties are IBOulets that are wired to the correct fields.
I can see the call to:
- (NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row
In my NSViewController:awakeFromNib i do:
// Make my view controller the delegate
_applicationTableView.delegate = self;
// set the correct datasource
_applicationTableView.dataSource = [NWDataHolder sharedInstance];
// register the nib with the custom cell
[_applicationTableView registerNib:cellNib forIdentifier:#"ApplicationListViewCell"];
In my - (NSView *)tableView:viewForTableColumn:row: i do:
NWApplicationListViewCell *cell = [_applicationTableView makeViewWithIdentifier:#"ApplicationListViewCell" owner:self];
The correct class and cell is returned and i have access to the properties.
The problem is, that subview is not initialized, the property is nil and the new value could not be set:
Log(#"Application Name Label %#", cell.applicationNameLabel); => nil
I`ve seen some hints that the subviews are initialized lazyly, but i cannot find a way to make the eager initialize.
Any suggestions what i'm doing wrong ?
Thanks,
Oliver
Fixed the problem. But i do not understand why this really happens.
I wired the fields in IB to the File Owner, but not to my ApplicationViewCell.
After wiring the property to both everything works fine.
I have three UITableViewCell subclasses. I'm displaying these in a table view in a view controller. I have, in the view controller, returning nil for tableView:willSelectRowAtIndexPath: since I want the UITextFields, in two of my UITableViewCell subclasses, to get focus and become first responder.
For the third UITableViewCell subclass, I have a custom UIView subclass that houses a UIWebView. Currently the div in the html content loaded in the UIWebView is one line tall. I previously made the div height 100% but found that scrolling started to act up. If I tap in the div the keyboard comes up. However, if the user taps any where else within this custom UITableViewCell the UIWebView div is not selected and the keyboard does not come up.
How can I get either my custom UITableViewCell or custom UIView subclass to become the first responder? Or am I going about this the wrong way?
I believe you're going about this the wrong way. Returning nil for tableView:willSelectRowAtIndexPath: won't really help your cause here.
Instead, you have a couple options. First, you could make a UIButton that sits behind your text fields in your table cell which fills the entire view, and then respond to touches on it and tell the text field to become active. Like so:
Wire up the button within your UITableViewCell subclass:
[self.button addTarget:self action:#selector(handleTouch) forControlEvents:UIControlEventTouchUpInside];
Set focus on the text field when touched:
- (void)handleTouch
{
[self.textField becomeFirstResponder];
}
The other option, and the one I like less, is to handle the selection of the cell in the delegate methods and tell the cell's textfield to become active. Like so:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
MyCustomCellSubclass *cell = [tableView cellForRowAtIndexPath:indexPath];
[cell.textField becomeFirstResponder];
}
In which of course you would need to add a textField property to your MyCustomCellSubclass in order to do this.
Hope this helps!
I want to remove the selection color that appears when I touch a cell in my tableview.
In IB there is a "shows selection" checkbox that does nothing and it seems from what I can gather that it is just a bug in IB.
But then there is the
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
that I can set to each cell.
This also does nothing, so this is where I am stuck, all documentation say that if I set this property it should not appear but it does.
I push another UIViewController on a UINavigationController, and when I go back to the view in question, the blue background on the cell is stuck until I touch another one.
The only thing special is that I instantiate this UITableViewController with the help of storyboard and I use prototype cells. Then I put it inside a UIScrollView to have horizontal paging between multiple UITableViewControllers. There is no way to access the navigation controller when I do this so I pass the UINavigationController along to the UITableView.
Sorry that I can't make the keywords appear as code, it says I should press the tab key then type a $ but that moves my cursor to tags.
You might try to set the selectedBackgroundView of your cell like this :
customCell.selectedBackgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"background.png"]];
In the delegate method cellForRowAtIndexPath
From code you can use (for example for grey):
cell.selectionStyle = UITableViewCellSelectionStyleGray;
And put this at:
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
In your ViewController.
The solution was to set the style on the prototype cell in IB. Many things are wierd about prototype cells.
I'm trying create TableViewCells which mimic buttons. This means that on touch down, there should be a highlight effect and on touch up should trigger the standard selected state. This works as intended, but the problem is that there is a split second delay between touch down and the highlighted state appearing. Why is this? How can I make the highlight appear immediately on touch down without the delay?
Here's the code I'm using on my TableView delegate:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[[tableView cellForRowAtIndexPath:indexPath] setSelected:YES animated:NO];
// do something here
[[tableView cellForRowAtIndexPath:indexPath] setSelected:NO animated:NO];
}
I suppose I don't really understand your question as you've asked it. UITableViewCell already acts "like a button" when pressed in the sense of it highlighting. From the looks of your code, it really does nothing that the tableView doesn't do natively.
Basically, the reason you are seeing a delay is because the cell already highlights on touch, and what you are doing is setting Selected to YES, then NO, but the cell already does this, so it's kind of doing the same thing twice, once on it's own, then once forced — this is the reason for the delay you are seeing.
The only thing that should go in didSelectRowAtIndexPath: is the actions you want to happen when the button is pressed, NOT what you want the cell to do or how it should behave upon being touched. There are other delegate methods that would handle these behaviors.
If you are looking to change the highlight color of the cell, then see my question/answer here.
Update
By default, the UITableView code provided by Apple does not contain the deselect method. So when you select the cell it stays selected. To deselect the cell, add the following method to didSelectRowAtIndexPath:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
/* The following will deselect the cell on touchUp */
[tableView deselectRowAtIndexPath:[tableView indexPathForSelectedRow] animated:YES];
}